What does 'brat', chosen as Collins word of the year, mean?

Collins Dictionary declared 'brat' its word of the year for 2024. It has been newly defined as someone who is "characterised by a confident, independent, and hedonistic attitude". The dictionary credited British singer Charli XCX for making 'brat' one of the most talked about words of the year. It's a cultural phenomenon that has resonated with people globally, Collins said.